ASTM D3766-86(1997)
(Terminology)Standard Terminology Relating to Catalysts and Catalysis
Standard Terminology Relating to Catalysts and Catalysis
SCOPE
1.1 This terminology contains definitions of terms and descriptions of terms related to catalysts and catalysis.
Note 1—"The Manual of Symbols and Terminology for Physicochemical Quantities and Units-Appendix II. Definitions, Terminology and Symbols in Colloid and Surface Chemistry. Part II: Heterogeneous Catalysis," Pure and Applied Chemistry, Vol 46, No. 1, 73-90(1976). This document presents authoritative descriptions of many terms used in the field of catalysis.
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Designation: D 3766 – 86 (Reapproved 1997)
Standard Terminology Relating to
Catalysts and Catalysis
This standard is issued under the fixed designation D 3766; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope of discrete pieces of solid material to the sum of the volumes
of: the solids in each piece, the voids within the pieces, and
1.1 This terminology contains definitions of terms and
the voids among the pieces of the particular collection.
descriptions of terms related to catalysts and catalysis.
density, particle (envelope)—the ratio of the mass of a
NOTE 1—“The Manual of Symbols and Terminology for Physicochemi-
particle to the sum of the volumes of: the solid in each piece
cal Quantities and Units—Appendix II. Definitions, Terminology and
and the voids within each piece, that is, within close-fitting
Symbols in Colloid and Surface Chemistry. Part II: Heterogeneous
imaginary envelopes completely surrounding each piece.
Catalysis,” Pure and Applied Chemistry, Vol 46, No. 1, 73–90(1976). This
density, skeletal—the ratio of the mass of discrete pieces of
document presents authoritative descriptions of many terms used in the
solid material to the sum of the volumes of: the solid
field of catalysis.
material in the pieces and closed (or blind) pores within the
2. Definitions
pieces.
density, theoretical—the ratio of the mass of a collection of
activity—of a catalyst, the measure of the rate of a specific
discrete pieces of solid material to the sum of the volumes of
catalytic reaction conducted in the presence of a catalyst.
said pieces, the solid material having an ideal regular
catalyst bed support—an essentially inert plate, grid, particu-
arrangement at the atomic level.
late bed, or other structural component designed to hold up
envelope—of a particle in catalysis, a theoretical surface that
or bear a quantity of catalyst in a catalytic reactor.
encloses the particle and that bridges openings to the interior
catalyst carrier—a solid, generally porous material upon the
of the particle.
surface or into the voids of which catalytic materials are
pore—in catalysis, a small opening in a material permitting
placed to create the desired catalyst.
admission, adsorption, or passage of a fluid.
DISCUSSION—A carrier may have or contribute to catalytic activity.
porosity—of particles in catalysis, the ratio of the volumes of
the pores in the particles to the volumes enclosed by their
catalyst substrate—less preferred altern
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